Which helicopter rotor system is known for having less complexity compared to articulated systems?

• A. Rigid rotor system
• B. Flexible rotor system
• C. Articulated rotor system
• D. Composite rotor system

Answer: (A)

The correct answer is the rigid rotor system, which is recognized for its simplicity in design compared to articulated systems. In a rigid rotor system, the blades are attached directly to the rotor hub without any hinges or flexible joints. This lack of moving parts reduces the complexity of the rotor system, leading to fewer potential points of failure.

Furthermore, because there are no hinges, rigid rotor systems can provide better performance in terms of strength and stability, allowing for a more direct transmission of forces. This design also typically results in reduced maintenance requirements and enhanced life span of components, as there is less mechanical wear due to the absence of articulating parts.

In contrast, articulated rotor systems employ hinges or flexible joints that allow for blade movement and articulation, which introduces additional complexity in both the design and mechanical operation. Composite rotor systems generally refer to the materials used rather than the complexity of the rotor mechanics. Therefore, the comparison focuses on how rigid rotor systems streamline functionality, leading to increased reliability and efficiency.